Tona T20/40 – MC Step-Up Transformer

Tona_T20-40_Moving-Coil_SUT_Step-Up_v4

 

TONA T 20/40 step-up transformer SUT is targeted enthusiasts and intended for Moving-Coil type  cartridges. These traditionally provide a very low signal, and are difficult to amplify without noise.

The TONA T 20/40 step-up transformer is a match for tube amplifiers, as the very high gain at 1:40 can be an advantage at low volume, and can also be used with a (tube) MM RIAA with a good dynamic range at high levels.
At the same time, 1:20 with a more all-round 26dB gain instead of 31dB, is usable for most cartridges with low output.
Since the T 20/40 has two separate inputs with separate windings on the primary side, they can be used independently for two tone arms.


Specifications

• Two inputs 1:20 and 1:40
• Specify balanced (XLR) or ubalanced/balanced (RCA) when ordering
• Laminated soft iron case with 8 to 20 mm overall thickness
• Wideband toroidal nanocrystalline transformers wound inhouse
• Primary resistance 0.1 Ω (1:40)
• Secondary resistance 30 Ω (1:40)
• The transformers are induction matched in stereo pairs before winding
• Low noise and wide frequency spectrum (5Hz-100kHz -3dB at 4Ω/20KΩ).
• Phase linearity 0.9 degree at 20kHz
• Matched in stereo 0.3 dB 20Hz-20kHz
• Litz primary winding
• Connectors : Rhodium plated RCA connectors, gold plated XLR connectors
• Non vibration dampening material floats the transformers
• Stable heavy base accepts all XLR and RCA cables
• Including solid mahogany case, that can be placed on the wall.
• Demagnitized before shipping
• CE and ROHS approved
• 2 years warranty
• Hand made in Aarhus, Denmark

Dimensions 125 x 150 x 46 mm 4.9″ x 5.9″ x 1.8″
Total height 63 mm 2.48″
Weight 4.1 Kg 9 lbs

Delivery time 1-2 weeks.
Suggested retail price 3.500 USD / 3.000 EUR
Distribution


Examples of ratios available with a 47KΩ MM phonostage
Cartridge see this load in Ohm Turns Ratio 1: Max possible gain in dB
30 40 31,9
35 37 31,3
40 34 30,7
45 32 30,2
50 31 29,7
60 28 28,9
70 26 28,3
80 24 27,7
90 23 27,2
100 22 28,9
120 20 25,9
140 18 25,3
160 17 24,7
180 16 24,2
200 15 23,7
250 14 22,7
300 13 21,9
325 12 21,6
475 10 20

1:40
Frequency response 4Ω/20KΩ (-60DBFS +13dBu) -3dB: 5Hz – 100kHz
Phase deviation 20Khz: 0.9 degree
Channel separation: 120dB
Stereo channel balance: 0.3dB (20Hz-20kHz)